/*

Copyright (C) 2000,2001  Franz Josef Och (RWTH Aachen - Lehrstuhl fuer Informatik VI)

This file is part of GIZA++ ( extension of GIZA ).

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.

*/
#ifndef AlignmentArray4_h_DEFINED
#define AlignmentArray4_h_DEFINED

#include "Array2.h"
template<class T> class Array4
{
private:
  Array2< Array2<T>* > A;
  int M;
  T init;
public:
  Array4(int m,const T&_init)
    : A(m,m,0),M(m),init(_init) {}
  ~Array4() {
    for(int l=0; l<M; ++l)
      for(int m=0; m<M; ++m)
        delete A(l,m);
  }
  const T&operator()(int i, int j, int l, int m)const {
    if( A(l,m)==0 )
      return init;
    else
      return (*A(l,m))(i,j);
  }
  const T&get(int i, int j, int l, int m)const {
    if( A(l,m)==0 )
      return init;
    else
      return (*A(l,m))(i,j);
  }
  T&operator()(int i, int j, int l, int m) {
    if( A(l,m)==0 ) {
      A(l,m)=new Array2<T>(max(l+1,m+1),max(l+1,m+1),init);
    }
    return (*A(l,m))(i,j);
  }
  void clear() {
    for(int l=0; l<M; ++l)
      for(int m=0; m<M; ++m)
        if( A(l,m) ) {
          Array2<T>&a=*A(l,m);
          for(int i=0; i<=l; ++i)
            for(int j=0; j<=m; ++j)
              a(i,j)=0.0;
        }
  }
};

#endif
